Belief in God is rational.
Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED. (You could prove the first step a priori that everything has a cause by noting that nothing can come from nothing. This makes it a priori, not just an empirical observation).

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24.7.15

I would like to suggest to make a Lithuanian yeshiva in every town. The idea would be that you would have a regular normal Litvak yeshiva program for four years but it would be open house for people to come in and learn just like in the great Lithuanian yeshivas in NY. The basic program would be an in depth session in the morning and a faster session in the afternoon. Plus it would have the regular Musar Jewish ethics books. That is it would be following the basic orientation of the Gra.

This would not be teaching people to use Torah for money. It is not a kollel. Nor would it be to get people to repent. It is rather to teach people to get to the level of proficiency that an average guy needs in order to be able to learn Torah on his own. And that takes about four years about 10 hours a day.

And it is clear that Christian civilization can't survive without yeshivas. They lose track of what the law is.